#define _CRT_SECURE_NO_WARNINGS 1
#include<iostream>
using namespace std;



void MergeSortNonR(int* a, int n)
{
	int* tmp = (int*)malloc(sizeof(int) * n);
	if (tmp == NULL)
	{
		perror("malloc fail");
		return;
	}

	int gap = 1;
	while (gap < n)
	{
		int i = 0;
		for (i = 0; i < n; i += 2 * gap)
		{
			int begin1 = i; int end1 = i + gap - 1;
			int begin2 = i + gap; int end2 = i + 2 * gap - 1;
			int k = i;
			if (begin2 >= n)
			{
				break;
			}
			if (end2 >= n)
			{
				end2 = n - 1;
			}
			while (begin1 <= end1 && begin2 <= end2)
			{
				if (a[begin1] <= a[begin2])
				{
					tmp[k++] = a[begin1++];
				}
				else
				{
					tmp[k++] = a[begin2++];
				}
			}
			while (begin1 <= end1)
			{
				tmp[k++] = a[begin1++];
			}
			while (begin2 <= end2)
			{
				tmp[k++] = a[begin2++];
			}
			memcpy(a + i, tmp + i, sizeof(int) * (end2 - i + 1));

		}

		gap *= 2;
	}
	free(tmp);
}